Electric drill holder and work clamp



Jan. 13, 953 APE; HANSON 256255053 ELECTRIC DRILL HOLDER AND WORK CLAMPFiled F'b. 25, 1952 IIIVIIII'OR ANDRE'WEZ HANSON Baa/M ATTORNEYSPatented Jan. 13, 1953 UNITED STATES PATENT OFFICE ELECTRIC DRILL HOLDERAND WORK CLAMP Andrew E. Hanson, Linden, Calif.

Application February 25, 1952, Serial No. 273,245

, 8 Claims. 1

The present invention is directed to, and it is an object to provide, anovel device adapted to support a portable or hand-type electric drillfrom the work, with the twist drill in proper alinement with thedrilling point, and for forceful engagement with said work.

Another important object of this invention is to provide a drill holderand work clamp which includes a novel clamping unit which is operativeto automatically clamp the holder in fixed position on the work inresponse to the application by a hand lever of drilling pressure on thedrill.

An additional object of this invention is to provide a drill holder andwork clamp, as in the preceding paragraph, wherein said clamping unit iscomprised of a fixed jaw and a movable jaw adapted to engage oppositefaces of the work, the movable jaw being actuated toward the fixed jawin work clamping relation in response to the force exerted by one end ofthe hand lever which is v jaw.

employed to thrust the drill toward said work;

the jaws being secured in assembly and actuated from said lever in anovel manner.

A further object of the invention is to provide novel means for readilyattaching a portable electric drill to said drill holder and work clamp.

A still further object of the invention is to provide a practical,reliable, and durable electric drill holder and work clamp, and onewhich will be exceedingly effective for the purpose for which it isdesigned.

- These objects are accomplished by means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspecification and claims.

In the drawings:

Fig. 1 is a side elevation of the drill holder and work clamp as in use.

Fig. 2 is a fragmentary outer end view, showing particularly theclamping unit.

Fig. 3 is a fragmentary side elevation showing a modification of theclamping unit, especially designed for thick work. Referring now moreparticularly to the characters of reference on the drawings, and atpresent to the embodiment of Figs. 1 and 2, the novel, drill holder andwork clamp comprises a work engaging clamping unit, indicated generallyat I, and adapted to clampingly engage from one edge on the work 2 to bedrilled.

The clamping unit I includes a jaw body 3 comprised of transverselyspaced, upstanding side plates 4 connected at the front and in the upperhalf by a filler block 5.

The lower portion of the jaw body 3 is formed as an inwardly opening,generally C-shaped fixed jaw 6; the lowerand inner-portion of said'fixedIt will thus be recognized that with the work 2 engaged at one edgeportion in said throat of the fixed jaw 6, upward swinging of the outerend of the movable jaw 9 will cause the eccentric working edge H to movedownwardly in clamping engagement with the work.

To assure of effective engagement with work varying slightly inthickness, the screw 8 is provided for adjustment of the effective rangeof the jaw assembly.

A slide plate I2 is disposed between th side plates 4 of the jaw body 3above the movable jaw 9; said slide plate 12 being guided forstraight-line motion lengthwise of the jaw body 3 by means of spacedcross pins I3 through said body 3 with such pins running in alongitudinal slot [4 in the slide plate I2.

The adjacent outer corner of the slide plate l2 and adjacent end of themovable jaw 9 are links connected, as at l5, with the pivots indicatedat I6.

At the end remote from the jaw body 3 the slide plate I2 is coupled tothe adjacent end of an upstanding post I! by means of a longitudinalaxisswivel connection l8.

A handle 'I 9 is adjustably pivotally connected to the post I1, asat 20,and thence extends laterally inwardly in overhanging relation to thework 2, and an attachment sleeve 2| is adjustably secured on said handleby a locking screw 22. 1

On the under side the attachment sleeve 2| is pivotally connected, as at23, to a clamp 24 engaged in holding relation about the grip 25 of aportable electric drill 26 which includes a chuck 21 adapted to hold thetwist drill 28 for engagement with the work 2.

When the described drill holder and work clamp is in position to use, asin Fig. 1, downward motion on the outer end of the handle 19 causes thetwist drill 28 to be forcefully thrust into en'- gagement with the work2 for eifective drilling, and at the same time the inner end of saidhandle [9 tends to swing upwardly about the pivot 23 as an axis. Thisexerts a pull in a corresponding direction on the post I1, and suchpullin motion, as transmitted by the links 15, swings the mov- 3 ablejaw 9automaticallyso that the work 2 is effectively clamped between thescrew 8 of the fixed jaw 6 and said movable jaw 9.

With the device thus used the portable electric drill 21' is not onlyeffectively supported and stabilized, but a relatively great thrust isimparted to the twist drill 28, as is desirable for proper drillingoperations.

The swivel connection l8 permits the handle I9 to be manually adjustedlaterally to the right or left relative to the clamping .unit .I, and assetting of the drill may require.

Under certain circumstances it may be desired to lock the clamping unitI to the work .2, whether or not the handle be in use. Such locking isaccomplished by a nut 29 welded to the outside of the filler block 5 atits innerend, with a screw 33 threaded through the nut 29 for adjustmentlongitudinally of the jaw body 3.. By running the screw 30 intoengagement with the movable jaw 9, the jaw assembly can be caused tofixedly clamp the work 2.

In Fig. 3 the drill holder and work clamp is shown as modified forengagement with relative thick work 3|. Here the jaw body 32, at theupper portion thereof, is constructed as before, and carries thepivotally mounted movable jaw 33 actuated by linkage 34 from a slideplate 35.

Here, however, the fixed jaw unit, indicated generally at 35, iscomprised of a shank 31 which depends from the body 32; said shank beingrectangular in cross section and formed at its lower end with a stophead 38. The lower jaw part .39 is included in a slide 49 which runs onthe shank 31, being held in selective position of adjustment by a pawl4| on the slide cooperating with a rack 42 on the shank.

A nut 43 and adjustment screw 44 complete the lower jaw part 39.

In the above described modified embodiment of the invention, theC-shaped jaw unit 36 is normally fixed, being used in the same manner asin the embodiment in Fig. 1, except that the opening or throat of saidjaw unit may be varied by adjustment of the slide on the shank 31,

The described drill holder, in both of its embodiments, provides adevice whereby a portable electric drill can be used with greaterconvenience and facility than otherwise; the twist drill 28 being moreeasily maintained on the drilling point, and much greater drillinpressure being exerted.

From the foregoing description it will be readily seen that there hasbeen produced such a device as substantially fulfills the objects of theinvention, asset forth herein.

While this specification sets forth in detail the present and preferredconstruction of the device, still in practice such deviations from suchdetail may be resorted to as do not form a departure from the spirit. ofthe invention, as defined by the appended claims.

Having thus described the invention, the fol lowing is claimed as newand useful, and upon which Letters Patent are desired:

1. An electric drill holder and work clamp comprising-a jaw body havinga laterally projecting fixed jaw adapted to engage under the work fromone edge thereof, a laterally projecting movable jaw pivoted on the bodyfor swin ing to engage on the work opposite the fixed jaw, a slidemember mounted on the jaw bad for motion away from the movable jaw andthe work, linkage between said slide member and movable jaw operative toso swing the latter upon such motion of said member, a post secured tothe slide member projecting away from the work, a hand lever pivoted toand projecting laterally from the post overhanging the work, and meansadapted to attach the hand lever to a portable electric drill with thelatter extending toward said work.

2. An electric drill, as in claim 1, including a longitudinal axisswivel connection securing the post to the slide member.

3. An electric drill holder and work clamp, as in claim 1, in which thejaw body includes an elongated shank extending from the body in adirection opposite the post, a slide on said shank, and means to adjustthe position of the slide on said shank; the fixed jaw being carried bysaid slide.

4. An electric drill holder and work clamp, as in claim .3, including apawl and ratchet connection between the slide and shank.

5. An electric drill holder and work clamp comprising a jaw body havinga generally 0- shaped fixed jaw opening laterally, a movable jaw pivotedintermediate its ends on the jaw body for motion at one end into theC-shaped fixed jaw whereby to clamp work disposed therea slide membermounted on the jaw body beyond and for motion in a direction away fromthe movable jaw and the work, actuating linkage between the slide memberand movable jaw operative to cause the latter to move in a work clampingdirection upon the slide member .moving away from the work, a postsecured to the slide member projecting away from the work, a hand leverpivoted to and projecting laterally from the post overhanging the work,and means adapted to attach the hand lever to a portable electric drillwith the latter extending toward said work.

6. An electric drill holder and work clamp, as in claim 5, in which thejaw body includes spaced side plates, the movable jaw and slide memberbeing disposed therebetween, said member being a flat plate having alongitudinal slot therein, and spaced cross pins between the side platesengaging through the slot.

'7. An electric drill holder and work clamp, as in claim 6, including alongitudinal filler block between a portion of said side plates; and oneedge of the flat slide member plate bearing in guided, relation on saidfiller block.

8. An electric drill holder and work clamp comprising a clamping unitadapted to engage the work and including a movable jaw, a postprojecting away from the work, a hand lever pivoted to the post andextending laterally therefrom for swinging in a direction toward thework, means to attach the lever to a drill, means securing the inner endof the post in connection with the clamping unit for longitudinalmovement of the post away from the work, and means between the post andmovable jaw and responsive to such movement f the post to actuate saidmovable jaw in a work clamping direction.

ANDREW E. HANSON.

REFERENCES CITED UNITED STATES PATENTS Name Date Cook June 10, 1930Number 1,736,552

